1984-11-03 — Page 25

六期星

syringe decreases and the greater

育教僑華頁三第張六第

1985:

日一十月十年子甲夏

WAH KIU YAT PO

報日僑華

life process.

d) State andther means

to

中學會考試題預習專欄

Syringe

·Plunger,

生物

(+)

D

increase the intake air other than increasing the rate breathing.

of

of

EUR 242##*# Glass Tube Balloon

e) (i) which portion of

the brain sends

c)

BIOLOGY (7)

W-W. LEUNG

MILI & DALE PRESS LTD.

Unit 2: Gaseous exchange

between organismS

·and environment

7. The diagram below

shows an apparatus at the end of an experiment in which the respiratory activities of snails were investigated. The screw clips were open for one minute, and then closed to begin the experiment,

Rubber Scale tube

Screw clip

Screw clip

JUD

Snails Coloured water

in a capillary:

U-tube

Thick cloth.

Gas

Name the apparatus.

b) What is the purpose

of using

(i) the thick cloth? (ii) the screw clips?

c) How many unit(s) had

the coloured water. level at side B risen during the experiment? d) Explain the rise of

at side

coloured watee:

B.

e) Did the changes in

environmental conditions affect the result? Explain your

answer,

Suggest two ways to increase the rate of rise of the coloured water at side B.

8. The diagram below.

shows a model

constructed to

represent the

structures of thorax.

It is used to

demonstrate certain

1985

中學會考試題預習專欄

化

墨

(E)

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CHEMISTRY (7)

REGINALD W. CHU

MILL & DALE PRESS LTD.

Question 101

(a)In the experiment as

shown below oxygen gas is bubbled through some concen- trated aqueous ammonia solution above which a hot platinum spiral is hanged from a glass rod.

охуден

gas

a) what part of the

thorax does the plunger represent? State and explain the effect that is brought by pulling back the plunger.

c) (1) What does the wal

of the syringe represent?..

(ii)What effect wil the lungs

on

be if this part. the body is perforated?

d) An athlete can release

sufficient energy in

his muscles to rùn a 100 metre race without having to breathe. (1) Name the substance

that will

accumulate in his muscles.

ii)Describe the

actions be will take to remove"

this substance.

9. The graph below shows

the effects of

Breaths per minute

inspiring room air, 100% oxygen and 92% oxygen, 8% carbon dioxide on the

breathing rate.

of

mán.

92% 0,8% CO

Room air

100% 92

AIR & GAS

4 AIR Time ON SUPPLE OFF (minutes)

a) From the graph find

the normal breathing rate of the man.

b) According to the above graph, which factor seems to play a decided part in governing the

breathing rate?

c) What is the effect of

this factor

on the

breathing rate?

platinum spiral?

(iv) The platinum

spiral has to be heated initially. However, once reaction has

the

started, no more

heating of the

platinum spiral is

necessary. Explain

why is this so.

What would you

observe if u few drops of blue litmus solution is added into the flask at the end of the reaction? Explain your answer briefly.

(b)In the experiment as shown below, ammonia gas is dried and: then passed over a metallic oxide X. A colourless liquid Y and a colourless gas Zare obtained as

the products.

out nerve impulses to control the rate of breathing?

ii)What are the

two

structures that respond to these impulses?

f) Explain why the

ambulances are

commonly equipped with

resuscitators with

tanks containing a

mixture of 95% oxygen

athospheric pressure. forces air into the balloon..

(1) Thoracic wall. (ii) The air sars wiEF

collapse and stick together. The Fungs- will not be inflated.

(1) Lactate. (ii)He will

increase his

breathing to intake

more oxygen to

oxidize the

accumulated lactate.

物理

(七)

and 5% carbon dioxide. 1809 HARR

Answa

76

a) The differential

thermometer

) The thick cloth is

used as an insulating material to reduce. heat exchange with the environment. (ii)The screw clips are

used to equalize the gas pressure at both sides before the experiment and maintain a close system during the experiment.

c) 2 units.

ide

d) The respiration of the

snails released heat energy which caused. expansion of air in: the test tube at A. The expanded air pushed the coloured water towards side B.

The changes in environmental conditions did not affect the result because both sides were subject to the same changes,

f)

(1) Increase the numbe

of snail's. (ii)Increase the

8.

activities of the snails.“

a) Diaphragm.

b) The balloon is

inflated because pressure in the

ammonia gas.

(iv) Would there be any

reaction if solid

(1)Zine(II) oxide; (2)lead(IT) oxide? If there is NO reaction, state so, If there is a reaction, name the product(s) and write an equation of the reaction.

Question 11

In the experiment below a mixture of potassium nitrate and concentrated sulphuric is gently heated and aale-yellow liquid Y is collected in a round-bottomed flask cooled under the water- tap.

water

brown fumes

glass

receiver

concentrated

∙aqueous.

platinum spiral

ammonia

antmonia gas

solidx porcelain

·gas Z

boat.

the

•heat mixture.

solution.

a drying heat agent

cold water

(1)

Name the substance formed at the platinum spiral. Write an equation of its formation.

(ii) What would be observed near around the platinum spiral? Write an equation of its formation. (iii)What is the

function of the

syringe.

pale yellow liquid Y..

(a)Name the apparatus.

marked with X.

(b)Name the liquid Y.

liquid (c)write an equation of

Give the names of the substances Y and 7 respectively if X is copper(II) oxide. Give an equation of the reaction..

(ii) Give a chemical

test for the presence of Y. (iii)Suggest a substance suitable for drying

the formation of Y. (d)Name the brown fumes.

observed in the apparatus X. Write an equation of its formation.

(e)Why does the liquid Y collected has a pale-yellow colour? (f)Suggest a a simple way to remove the vellow

PHYSICS (7).

H.K. LO

MILL & DALE PRESS LTD.

Exerc

Mechanics, and. Properties of Matter

1. A truck travels along a horizontal straight road, the speed-time graph of its motion i; shown in figure 1. Speed (ms")

10 30 50 70

Figure 1

日三月一十年四八九一曆公年三十七國民華中

the truck before it decelerates.

A uniform metal rod B shea long is bent

into a right-angled 1-shaped piece as

shown in figure 2. The Wire is hung on a smooth peg at the point of bend. Find the angle between the 50 cm aro and the vertical when the piece is in

equilibrium.

30cm

Figure 2

50cm

A wooden block is weighed in air, in water and in liquid X

as shown in figure 3(a), fig. 3(b) and fig. 3(c) respectively (Deusity of water

-3 -1000 kgm ration due g=10 as)

accele- to gravity

(v).

the block A in

liquid X,

the density of liquid X.

(b) If a lump of metal i s

attached to the bottom of the block and causes the wooden block to float in water with its upper surface just covered by water as shown in figure (4)

Figure 3(d) Find the mass

of metal

attached if the density of the metal is 8000 kgm-3.

in

4. A uniform glass tube

40 cm long is lowered.

into the bottom of a lake and water is found to rise 10 co the tube. If the atmospheric pressure is 760 mmHg, find the depth of water in the lake, (Density of water in the Jake

-3.

density

-1200 kgm

of mercury

2N

13600 kgm

BN

stage

90

10 Time (insec.)

A

Fig. 3(a) Fig. 5(b)

0.5N

(a)Which stage of the

journey takes the longest time?

(b)During which stage of

the journey does the car travel the greatest

(c)During which stage(s): of the journey does: the car travel in ́únīform speed?^*~

(4)During, which stage of

the journey is (1) the speed greatest,

(ii) the acceleration

greatest,

(iii) the kinetic

energy greatest. (e)Compute the total

distance travelled by coloration of liquid

Y

(g)Why is it not

desirable to heat. strongly the mixture in the apparatus X?

(b)What is the purpose

of cooling the receiver under the tap water?

(i)Why is it necessary

to use an all-glass. apparatus in the above experiment?

(j)Describe what would

you observe and explain, with help of balanced equations, in each of the following cases: -..

the

1)A few copper turnings

is added into liquid Y. When the reaction the reaction ceases, mixture is filtered. The filtrate is then evaporated to dryness. in an evaporating dish and the solid residue is then heated

strongly until there is no further change. 2)A mixture of sulphur

powder and liquid Y is heated for some time, with a little of bromine present as the catalyst, The. reaction mixture is.. then filtered and to: the filtrate is added a few drops of ncidified barium chloride solution, Question 12.

In the experiment as shown below lead(TT)} nitrate crystals" are

liquid X.

Fig. 3(e)

(a)Calculate

(1)

the upthrust on

the block in water,

(ii) the volume of

the block A, (iii)the relative

density of block A..

(iv) the upthrust of

heated in a pyrex test- tube. A liquid X and gas Y are obtained.

lead (IL) nitrate

heat

Liquid

'gas

freezing mixture (a)Name the substances.

X and Y respectively.

(b)A solid residue Z is

left behind, in the pyrex-tube at the end of the reaction. What is solid (c)rite an equation of the reaction when lead(II) nitrate is strongly heated. (d)Why is it not

desirable to prepare the liquid X by heating copper(II) "nitrate crystals?

is it desirable (e)Why

to collect the gas Y over water?

is found that solid Z is only sparingly soluble in dilute sulphuric acid or dilute hydrochloric acid but very soluble in dilute nitric acid. Why is this 30?

(g)A few drops of liquid

X is dissolved in

water.

of distilled

1)Would the pll of the

resulting solution

be greater or

depth

LAKE

Figure 4

5. In figure 5, a copper

block of mass 0.089 kg and an iron. block are connected by a light cord passing over va pulley and hang in equilibrium when both are completely immersed in water.

water

Figure 5.

Find the mass of the iron block.

(Relative density of copper-8.9 iron=7.8)

smaller than 7?': ii)What would be formed

in the solution? i)Write an equation

of the reaction on: dissolving liquid Xin water. iv)Give the oxidation number of nitrogen in the substances mentioned in (ii). (h)what would he formed on dissolving liquid X in some dilute

sodium hydroxide. solution? Give an equation of the reaction.

(1)What would be obtained

on heating solid Z with powdered charcoal? Give an equation of the reaction.

(3)If 560 cm

of gas Y measured at s.t.p. was obtained in the above experiment, what is the mass of

Lead(II) nitrate reacted?

..

(k)In general, the

nitrates are thermally unstable and will decompose readily on

heating. Name the

product(s) and give an equation of the reaction when the

following nitrates are separately heated.

1)Potassium nitrate

crystals ii)Zine(II) nitrate

crystals

ii)silver nitrate

crystals iv) Ammonium nitrate

crystals.

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頁 第張六第

日一十月十年子甲蕃

WAH KIU YAT PO